Seeing that after 5 years no one has come up with a working flagstaff texture, I just took a free one for myself from a mod and I've been using it for months without problem (ATI HD7870 2GB)
You are not required to like this texture, there are millions of dds textures around... Better a grain of salt than nothing.
https://drive.google.com/file/d/0Byh...ew?usp=sharing